kelley went to the fbi with anonymous threatening e-mails. agents traced those to paula broadwell, and uncovered her affair with petraeus. one defense official describes the e-mails between general allen and kelley as flirtatious. another official tells cbs news some of the e-mails were more than friendly ex changes and may have crossed the line. general allen said he did nothing wrong, but for now the capitol hill hearings on his promotion are delayed. >> at the request of the secretary of defense the president has put on hold general allen's nomination. >> reporter: in addition to social using with kelley, both general allen and petraeus wrote letters of support foreher sister in a custody battle. even though petraeus has resigned, lawmakers returning to washington want to hear what he has to say about the deadly attack on the u.s. consulate in benghazi, libya. >> i think it is absolutely imperative that general petraeus come and testify. >> reporter: some congressional leaders have also called for a joint house-senate probe into the petrae